我正在开发一个有登录屏幕的应用程序。它以用户默认值记录用户是否登录。我想引导用户到登录页面,如果他还没有登录,否则导航到应用程序主屏幕。如何使用故事板进行编程。
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"loggedin"]) {
//If logged in
} else {
//if logged out
}
在您的appdelegate中编写以下代码。别忘了给你的视图控制器提供标识符名称
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>];
self.window.rootViewController = viewController;
[self.window makeKeyAndVisible];
return YES;
}
为什么不总是以"加载"视图启动应用程序。LoadingViewController检查用户是否登录,然后转换到正确的视图控制器。